Except for hagfishes, sharks, and rays, aquatic vertebrates tend to

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Aquatic vertebrates, except for hagfishes, sharks, and rays, tend to be osmoregulators, meaning they actively regulate the water and ion balance in their bodies. They are also ionic regulators, meaning they maintain specific concentrations of ions within their bodies. This is necessary because the concentrations of ions and water in seawater and freshwater are different from those inside the bodies of these animals.

Except for Hagfishes, Sharks, and Rays, Aquatic Vertebrates Tend to